Final answer:
Early or Stage 1 Alzheimer's typically lasts for several years and is characterized by mild symptoms such as memory problems and changes in personality or behavior.
Step-by-step explanation:
Early or Stage 1 Alzheimer's typically lasts for several years, but the duration can vary from person to person. It is important to note that Alzheimer's disease is a progressive condition, meaning that it worsens over time. The symptoms during the early stage may be mild and may include memory problems, confusion, difficulty with planning or organizing, and changes in personality or behavior.